CN110523397A - A kind of SiO2/ chitosan-based lead ion trace hollow microsphere preparation method - Google Patents

A kind of SiO2/ chitosan-based lead ion trace hollow microsphere preparation method Download PDF

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CN110523397A
CN110523397A CN201910854005.3A CN201910854005A CN110523397A CN 110523397 A CN110523397 A CN 110523397A CN 201910854005 A CN201910854005 A CN 201910854005A CN 110523397 A CN110523397 A CN 110523397A
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sio
chitosan
hollow microsphere
lead ion
preparation
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CN110523397B (en
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刘瑞来
刘丽敏
齐小宝
赵升云
胡家朋
林皓
付兴平
赵瑨云
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Jinjiang Rui Bi Technology Co Ltd
Wuyi University
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Jinjiang Rui Bi Technology Co Ltd
Wuyi University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/268—Polymers created by use of a template, e.g. molecularly imprinted polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • B01J20/28021—Hollow particles, e.g. hollow spheres, microspheres or cenospheres
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Abstract

The invention discloses a kind of SiO2The preparation method of/chitosan-based lead ion trace hollow microsphere comprising polyaminoester microball following steps: is prepared by the method for Thermal inactive；After ethyl alcohol, distilled water, sodium metasilicate, polyethylene glycol and surfactant are mixed, the polyaminoester microball is added, forms mixed liquor；SiO is prepared using the mixed liquor2Hollow microsphere；It dissolves the chitosan in acrylic acid aqueous solution, plumbi nitras is added, after mixing, SiO is added2Hollow microsphere and ammonium persulfate obtain the SiO through series reaction2/ chitosan-based lead ion trace hollow microsphere.The present invention is with following the utility model has the advantages that using polymer microballoon as template, and by orthosilicic acid in its area load, finally calcining obtains SiO2Hollow microsphere, the SiO of preparation2Hollow microsphere has high porosity, bigger serface, can be used as the carrier of catalyst, adsorbent, drug loading.

Description

A kind of SiO2/ chitosan-based lead ion trace hollow microsphere preparation method
Technical field
The present invention relates to a kind of SiO2The preparation method of/chitosan-based lead ion trace composite hollow microballoon, belongs to absorption Field of material technology.
Background technique
Chitosan is unique natural alkaline polysaccharide existing for nature, is to be obtained by chitin by deacetylation , intramolecular contains a large amount of active amino and hydroxyl group.The presence of these functional groups is easy chitosan and various gold Belong to and combining, form metallo-organic complex, to achieve the purpose that heavy metal ion in water removal.Chitosan is mainly with powder at present Last form exists, and the stability of chitosan in aqueous solution is poor, is restricted its application.Based on the above reasons, Researchers pass through glutaraldehyde, epoxy often by the chitosan loaded inorganic material high in some large specific surface areas, porosity The cross-linking agents such as chloropropane, ethylene glycol ethylene oxidic ester.Due on chitosan amount of activated amino and carboxyl and crosslinking Agent reaction loses reactivity, substantially reduces the adsorption capacity of chitosan.Therefore crosslinking chitosan must with containing amino, Carboxyl and sulfydryl isoreactivity group graft reaction, to improve adsorption capacity.
Summary of the invention:
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of simple, quick, easy-operating SiO2/ shell is poly- The preparation method of glycosyl lead ion trace composite hollow microballoon.
The present invention is achieved by the following technical solutions:
A kind of SiO2The preparation method of/chitosan-based lead ion trace hollow microsphere comprising following steps:
Polyaminoester microball is prepared by the method for Thermal inactive；
After ethyl alcohol, distilled water, sodium metasilicate, polyethylene glycol and surfactant are mixed, the polyaminoester microball, shape is added At mixed liquor；
Ammonium chloride is added in the mixed liquor, mixes, after being reacted at 30~50 DEG C, product is washed, It filters and dries, calcined at 400~500 DEG C, obtain SiO2Hollow microsphere；
It dissolves the chitosan in acrylic acid aqueous solution, plumbi nitras is added, after mixing, SiO is added2Hollow microsphere and over cure Product is soaked in cross-linking agent aqueous solution by sour ammonium after being reacted at 50~70 DEG C, is crosslinked at 60~80 DEG C Afterwards, presoma is obtained；
The presoma is washed in hydrochloric acid, after removing lead ion, hydrochloric acid is washed away with distilled water, obtains the SiO2/ Chitosan-based lead ion trace hollow microsphere.
Preferably, the polyaminoester microball the preparation method comprises the following steps:
Polyurethane is dissolved in the in the mixed solvent of acetone and tetrahydrofuran, nanometer hydroxyapatite is added, is quenched Liquid；
It after the quenching liquid is quenched 3~5h at -40~-10 DEG C, is extracted with mixture of ice and water, removes mixed solvent, Washed and freeze-drying, obtains polyaminoester microball.
Preferably, in the quenching liquid, polyurethane, acetone, tetrahydrofuran mass ratio be (0.8~1.5): (3 ~5): (8~15), the mass fraction of nanometer hydroxyapatite are 0.1~0.5%.
Preferably, the ethyl alcohol, distilled water, sodium metasilicate, polyethylene glycol, cetyl trimethylammonium bromide, poly- The mass ratio of urethane microballoon and ammonium chloride is (10~25): 30:(1.2~2): 0.1:0.01:0.5:(1~1.5).
Preferably, the chitosan, acrylic acid, plumbi nitras, SiO2The mass ratio of hollow microsphere and ammonium persulfate For (0.5~1.5): (0.3~0.6): (0.15~0.3): 0.5:0.005.
Preferably, glutaraldehyde and thiocarbamide, the matter of the glutaraldehyde and thiocarbamide are contained in the cross-linking agent aqueous solution Measuring concentration is respectively 2~4% and 3~6%.
Preferably, the polyurethane is hydroxy-terminated polyester type polyurethane, and number-average molecular weight is 1 × 105~5 × 105。
Preferably, the surfactant is cetyl trimethylammonium bromide.
Mechanism of the invention is:
Using nanometer hydroxyapatite as nucleating agent, polyaminoester microball is prepared by Thermal inactive method.
It is template using polyaminoester microball, is that surface is living using polyethylene glycol as dispersing agent, cetyl trimethylammonium bromide Property agent, sodium metasilicate is reacted with ammonium chloride obtain orthosilicic acid and is loaded in microsphere surface, finally roasting removes template and obtains SiO2In Empty microballoon.By chitosan, acrylic acid and plumbi nitras chelatropic reaction, chelate solution is obtained, with SiO2Hollow microsphere is carrier, successively It is crosslinked by polymerization, glutaraldehyde and thiocarbamide, salt acid elution obtains SiO2/ chitosan-based lead ion trace composite hollow microballoon.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, using polymer microballoon as template, by orthosilicic acid in its area load, finally calcining obtains SiO2Hollow microsphere, system Standby SiO2Hollow microsphere has high porosity, bigger serface, can be used as the carrier of catalyst, adsorbent, drug loading；
2, SiO is utilized2Hollow microsphere has many advantages, such as porosity height, bigger serface, will have the function of heavy metal chelating It is chitosan loaded lead ion recognition site is introduced on microballoon using ionic imprinting technique on hollow microsphere, it is more retaining On the basis of the microballoon advantage of hole, its isolated ability highly selective to lead ion is assigned；
3, using glutaraldehyde and thiocarbamide modified crosslinking, sulfydryl is introduced on strand, is conducive to heavy metal ion Chelating absorption, substantially increases the absorption property of adsorbent.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon:
SiO prepared by Fig. 1 embodiment of the present invention 12The preparation flow of/chitosan-based lead ion trace composite hollow microballoon Figure；
SiO prepared by Fig. 2 embodiment of the present invention 12The scanning electron microscope of/chitosan-based lead ion trace composite hollow microballoon Figure；
SiO prepared by Fig. 3 embodiment of the present invention 12/ chitosan-based lead ion trace composite hollow microballoon adsorption capacity and when Between relation curve.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention Protection scope.
Explanation of nouns:
Imprinting factor: the ratio of trace sample and non-trace sample maximum adsorption capacity.
Pb2+/Cu2+Selectivity factor: selectivity factor is sample to Pb2+Maximum adsorption capacity with to Cu2+Maximum adsorption The ratio of capacity.
Used polyurethane is hydroxy-terminated polyester type polyurethane in the present invention, and number-average molecular weight is 1 × 105~5 × 105。
Embodiment 1
(1) quenching liquid is formulated as follows: 1g polyurethane, 3g acetone, 12g tetrahydrofuran are added in the three-necked flask of 100mL, 50 DEG C of magnetic agitation 2h, dissolution form homogeneous phase solution.0.02g nanometer hydroxyapatite, magnetic under room temperature are added into homogeneous phase solution Power stirring is mixed, and obtains quenching solution.By quenching solution be put into it is pre- be cooled in -20 DEG C of refrigerators quench 4h, after quenching, quickly It takes out, is put into 500mL ice water mixed liquor from refrigerator, remove acetone and tetrahydrofuran, change distilled water, washing, freezing repeatedly It is dried to obtain polyaminoester microball.
(2) by 10g ethyl alcohol, 30g distilled water, 1.2g sodium metasilicate, 0.1g polyethylene glycol, 0.01g cetyl trimethyl bromine Change ammonium to be added in three-necked flask, after dissolution, 0.5g polyaminoester microball is added, magnetic agitation forms mixed in magnetic agitation dissolution Close liquid.1g chloride leach is formed into ammonium chloride solution in 5mL distilled water, ammonium chloride solution, magnetic are added dropwise into three-necked flask Power stirring, 40 DEG C of reaction 0.5h.It washs, filter after reaction, drying.400 DEG C of calcining 2h of final sample, obtain SiO2It is hollow Microballoon.
(3) 0.6g chitosan is dissolved in 0.4g acrylic acid and 100mL distilled water, 0.2g plumbi nitras is added, mixing is equal After even, 0.5g SiO is added2Hollow microsphere and 0.003g ammonium persulfate initiator, magnetic agitation form mixed liquor, 60 DEG C of reactions 5h.It is 70 DEG C of reaction 8h in 2.5% glutaraldehyde and 4% thiocarbamide mixed aqueous solution that product, which is then immersed in 50mL mass concentration,.Leaching After bubble, taking-up is washed repeatedly with 1mol/L hydrochloric acid, removes template lead ion, finally residual to remove with a large amount of distillation water washings The hydrochloric acid stayed, is dried under vacuum to constant weight, obtains SiO2/ chitosan lead ion trace composite hollow microballoon, preparation flow figure such as Fig. 1 It is shown.
The diameter for the composite hollow microballoon that embodiment 1 is prepared is 40.4 ± 18.4 μm, porosity and specific surface integral It Wei not 89.1% and 5.23m2/g.Fig. 2 is composite hollow microballoon to the adsorption capacity of lead ion and the relational graph of adsorption time, In 20min, with the increase of adsorption time, adsorption capacity is sharply increased, and 20~70min adsorption capacity is gradually gentle, after 70min Reach adsorption equilibrium.The maximum adsorption capacity of composite hollow microballoon prepared by embodiment 1 is 178.23mg/g, and imprinting factor is 2.99, to Pb2/Cu2+Selectivity factor be 3.98, illustrate that the composite hollow microballoon has specific selectivity to lead ion.
Embodiment 2
(1) quenching liquid is formulated as follows: 1.5g polyurethane, 4g acetone, 8g tetrahydro furan being added in the three-necked flask of 100mL It mutters, 50 DEG C of magnetic agitation 2h, dissolution forms homogeneous phase solution.0.04g nanometer hydroxyapatite is added into homogeneous phase solution, under room temperature Magnetic agitation is mixed, and obtains quenching solution.By quenching solution be put into it is pre- be cooled in -30 DEG C of refrigerators quench 5h, after quenching, fastly Speed is taken out from refrigerator, is put into 500mL ice water mixed liquor, removes acetone and tetrahydrofuran, changes distilled water, washing, cold repeatedly Jelly is dried to obtain polyaminoester microball.
(2) by 25g ethyl alcohol, 30g distilled water, 1.5g sodium metasilicate, 0.1g polyethylene glycol, 0.01g cetyl trimethyl bromine Change ammonium to be added in three-necked flask, after dissolution, 0.5g polyaminoester microball is added, magnetic agitation forms mixed in magnetic agitation dissolution Close liquid.1.25g chloride leach is formed into ammonium chloride solution in 5mL distilled water, ammonium chloride solution is added dropwise into three-necked flask, Magnetic agitation, 40 DEG C of reaction 0.5h.It washs, filter after reaction, drying.500 DEG C of calcining 2h of final sample, obtain SiO2In Empty microballoon.
(3) 1.3g chitosan is dissolved in 0.6g acrylic acid and 100mL distilled water, 0.25g plumbi nitras is added, mixing is equal After even, 0.5g SiO is added2Hollow microsphere and 0.005g ammonium persulfate initiator, magnetic agitation form mixed liquor, 60 DEG C of reactions 5h.It is 70 DEG C of reaction 8h in 4% glutaraldehyde and 6% thiocarbamide mixed aqueous solution that product, which is then immersed in 50mL mass concentration,.It impregnates After, taking-up is washed repeatedly with 1mol/L hydrochloric acid, template lead ion is removed, finally with a large amount of distillation water washings to remove residual Hydrochloric acid, be dried under vacuum to constant weight, obtain SiO2/ chitosan lead ion trace composite hollow microballoon.
The diameter for the composite hollow microballoon that embodiment 2 is prepared is 44.4 ± 20.1 μm, porosity and specific surface integral It Wei not 88.1% and 5.01m2/g.The maximum adsorption capacity of composite hollow microballoon prepared by embodiment 1 is 168.12mg/g, trace The factor is 2.77, to Pb2/Cu2+Selectivity factor be 3.77, illustrate that the composite hollow microballoon has specific choosing to lead ion Selecting property.
Embodiment 3
(1) quenching liquid is formulated as follows: 1.2g polyurethane, 5g acetone, 7g tetrahydro furan being added in the three-necked flask of 100mL It mutters, 50 DEG C of magnetic agitation 2h, dissolution forms homogeneous phase solution.0.03g nanometer hydroxyapatite is added into homogeneous phase solution, under room temperature Magnetic agitation is mixed, and obtains quenching solution.By quenching solution be put into it is pre- be cooled in -25 DEG C of refrigerators quench 3h, after quenching, fastly Speed is taken out from refrigerator, is put into 500mL ice water mixed liquor, removes acetone and tetrahydrofuran, changes distilled water, washing, cold repeatedly Jelly is dried to obtain polyaminoester microball.
(2) by 20g ethyl alcohol, 30g distilled water, 1.8g sodium metasilicate, 0.1g polyethylene glycol, 0.01g cetyl trimethyl bromine Change ammonium to be added in three-necked flask, after dissolution, 0.5g polyaminoester microball is added, magnetic agitation forms mixed in magnetic agitation dissolution Close liquid.1.4g chloride leach is formed into ammonium chloride solution in 5mL distilled water, ammonium chloride solution is added dropwise into three-necked flask, Magnetic agitation, 40 DEG C of reaction 0.5h.It washs, filter after reaction, drying.450 DEG C of calcining 2h of final sample, obtain SiO2In Empty microballoon.
(3) 0.8g chitosan is dissolved in 0.5g acrylic acid and 100mL distilled water, 0.3g plumbi nitras is added, mixing is equal After even, 0.5g SiO is added2Hollow microsphere and 0.004g ammonium persulfate initiator, magnetic agitation form mixed liquor, 60 DEG C of reactions 5h.It is 70 DEG C of reaction 8h in 2% glutaraldehyde and 5% thiocarbamide mixed aqueous solution that product, which is then immersed in 50mL mass concentration,.It impregnates After, taking-up is washed repeatedly with 1mol/L hydrochloric acid, template lead ion is removed, finally with a large amount of distillation water washings to remove residual Hydrochloric acid, be dried under vacuum to constant weight, obtain SiO2/ chitosan lead ion trace composite hollow microballoon.
The diameter for the composite hollow microballoon that embodiment 3 is prepared is 39.4 ± 19.1 μm, porosity and specific surface integral It Wei not 92.9% and 6.18m2/g.The maximum adsorption capacity of composite hollow microballoon prepared by embodiment 1 is 180.11mg/g, trace The factor is 3.01, to Pb2/Cu2+Selectivity factor be 4.04, illustrate that the composite hollow microballoon has specific choosing to lead ion Selecting property.
Comparative example 1
Difference from Example 1 is: polyaminoester microball additive amount is 0, i.e. non-polymer template in step (2), is forged SiO is obtained after burning2Microballoon, due to no template, which is solid construction.The SiO is used in the step of postorder2Microballoon is raw material, Finally obtain SiO2/ chitosan-based lead ion trace complex microsphere.The microsphere diameter is 50.1 ± 22.1 μm, porosity and Bi Biao Area is respectively 44.8% and 2.68m2/g.SiO prepared by comparative example 12The maximum of/chitosan-based lead ion trace complex microsphere Adsorption capacity is 55.12mg/g.The maximum adsorption capacity of comparative example 2 is reduced to from 178.23mg/g compared with Example 1 55.12mg/g.The microballoon being primarily due in comparative example 2 is solid microsphere, and specific surface area and porosity substantially reduces, therefore is adsorbed Capacity reduces.
Comparative example 2
Difference from Example 1 is: plumbi nitras additive amount is 0 in step (3), finally obtains non-trace composite hollow Microballoon.The diameter of non-trace composite hollow microballoon is 40.9 ± 16.2 μm, and porosity and specific surface area are respectively 88.0% He 4.84m2/g.The maximum adsorption capacity of non-trace composite magnetic hollow microsphere is 57.18mg/g, adsorption capacity and adsorption time Curve it is as shown in Figure 3.Compared with lead ion trace composite hollow microballoon, non-trace microballoon adsorption capacity is substantially reduced.Mainly Because there is no the holes to match with lead ion size in non-trace microballoon.
Comparative example 3
Difference from Example 1 is: crosslinking agent thiocarbamide amount is 0 in step (3), finally obtains SiO2/ chitosan-based Lead ion trace composite hollow microballoon.The diameter of the microballoon is 41.1 ± 22.9 μm, and porosity and specific surface area are respectively 90.1% and 5.09m2/g。SiO2/ chitosan-based lead ion trace composite hollow microballoon is to the maximum adsorption capacity of lead ion 110.18mg/g.Compared to comparative example 3, the SiO that is prepared in embodiment 12/ chitosan-based lead ion trace composite hollow microballoon Adsorption capacity increases to 178.23mg/g from 110.18mg/g.It is modified to be primarily due to thiocarbamide, sulfydryl is introduced on chitosan, Coordination chelating can occur with lead ion for sulfydryl, therefore adsorption capacity improves.
Comparative example 4
Difference from Example 1 is: the additive amount of the cetyl trimethylammonium bromide in step 1) is 0, finally Obtain SiO2The yield of magnetic microsphere is reduced to 20.1% from 41.1%.Being primarily due to cetyl trimethylammonium bromide is surface Activating agent is conducive to orthosilicic acid in polyaminoester microball area load, therefore SiO2The yield of hollow microsphere improves.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Ring substantive content of the invention.

Claims (8)

1. a kind of SiO2The preparation method of/chitosan-based lead ion trace hollow microsphere, which comprises the steps of:
Polyaminoester microball is prepared by the method for Thermal inactive；
After ethyl alcohol, distilled water, sodium metasilicate, polyethylene glycol and surfactant are mixed, the polyaminoester microball is added, is formed mixed Close liquid；
Ammonium chloride is added in the mixed liquor, mixes, after being reacted at 30~50 DEG C, product is washed, is filtered And drying, it is calcined at 400~500 DEG C, obtains SiO2Hollow microsphere；
It dissolves the chitosan in acrylic acid aqueous solution, plumbi nitras is added, after mixing, SiO is added2Hollow microsphere and ammonium persulfate, After being reacted at 50~70 DEG C, product is soaked in cross-linking agent aqueous solution, after being crosslinked at 60~80 DEG C, is obtained Presoma；
The presoma is washed in hydrochloric acid, after removing lead ion, hydrochloric acid is washed away with distilled water, obtains the SiO2/ chitosan Base lead ion trace hollow microsphere.
2. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute State polyaminoester microball the preparation method comprises the following steps:
Polyurethane is dissolved in the in the mixed solvent of acetone and tetrahydrofuran, nanometer hydroxyapatite is added, obtains quenching liquid；
It after the quenching liquid is quenched 3~5h at -40~-10 DEG C, is extracted with mixture of ice and water, mixed solvent is removed, through washing It washs and is freeze-dried, obtain polyaminoester microball.
3. SiO as claimed in claim 22The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute State in quenching liquid, polyurethane, acetone, tetrahydrofuran mass ratio be (0.8~1.5): (3~5): (8~15), nano hydroxyapatite The mass fraction of lime stone is 0.1~0.5%.
4. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute State the mass ratio of ethyl alcohol, distilled water, sodium metasilicate, polyethylene glycol, cetyl trimethylammonium bromide, polyaminoester microball and ammonium chloride For (10~25): 30:(1.2~2): 0.1:0.01:0.5:(1~1.5).
5. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute State chitosan, acrylic acid, plumbi nitras, SiO2The mass ratio of hollow microsphere and ammonium persulfate is (0.5~1.5): (0.3~0.6): (0.15~0.3): 0.5:0.005.
6. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute It states in cross-linking agent aqueous solution containing glutaraldehyde and thiocarbamide, the mass concentration of the glutaraldehyde and thiocarbamide is respectively 2~4% and 3~ 6%.
7. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute Stating polyurethane is hydroxy-terminated polyester type polyurethane, and number-average molecular weight is 1 × 105~5 × 105。
8. SiO as described in claim 12The preparation method of/chitosan-based lead ion trace hollow microsphere, which is characterized in that institute Stating surfactant is cetyl trimethylammonium bromide.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111388739A (en) * 2020-01-06 2020-07-10 太原理工大学 Nano silicon dioxide/decomposition enzyme/polycaprolactone composite microsphere and preparation method and application thereof
CN114452949A (en) * 2022-02-22 2022-05-10 武夷学院 SiO2Preparation method of microsphere/graphene/chitosan composite lead ion imprinted hydrogel
CN114685814A (en) * 2022-03-04 2022-07-01 武夷学院 Preparation method of composite chromium ion imprinted hydrogel

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